Improvement in let-off mechanism for looms



,Pste-ut i @man esse/fe THOMAS BOOTH AND CHARLES CARROLL SANDERSON, OFNOR- WAY, MAlNE.

Letters Patent No. 84,253, dated Noce1nber24, 1868.

IMPROVEMENT IN LET-OFF MECHANISM FOR LOOMS.

The Schedule referred to in these Letters Patent and'making part `of thesame.

To all whomv it may concern:

Beit known that we, THOMAS BOOTH and CHARLES CARROLL SANDERSON, both ofNorway, in the county of Oxford, and State ofMaine, have invented anewand useful SelflAdjusting Let-O" Mechanism for Looms; and we herebydeclare the following to be a full, clear, and exact descriptionthereof, which will enable others t0 make and use our invention,reference being had to the accompanying drawings, forming part of thisspeciiicatiou, in which is shown a view of a loom-beam with ourimprovement thereto attached.

In the drawings, a shows the part of the loom into which is set thejournal of the beam b.

The part c showsthe size of the full beam.

b, the empty beam, or when there is no yarn thereon;

It is well known that when cloth is being manufactured, the weaver isdirected to make the web with a certain' number of picks to an inch, forinstance, and

matic, aud is, moreover, liable to be 'tampered with by the operator,who, in the absence of the supervisor, cau change the rapidity of thedelivery of thegyarus, and so diminish the number of picks to an inch,and, in consequence, the irmness, solidity, and uniformity of the web.lVhen, as is usual, the operator is paid by the yard, this change isoften m'ade, in order to accom,- plish a larger amount of work within aday, ora'ny `given time.

Our invention seeks to place it within the power of the supervisor toarrange the delivery of the yarns so that they shall be uniformthroughout the whole web, and to make this regulating-device automaticin operation, and so that it cannot be changed by theoperative.

d shows a standard, attached to the cross-beam e,

'nearthc bottom of the loom. Ithas a )nvot at j, upon which are hung thecross adjusting-:ums g g. These arms can open or close, swinging Ourthesaid pivot.

Connected with r/ y, at h h., are the connecting-rods i yi., which arealso connected with the weights j j. These weights have holes, tlu'oughwhich pass the arms, L 1.', which are pivoted to the frame of the loomat m lm. From these aruis It' It friction-bauds pass up over the beam,or a truck thereon. (See n n.) At the lower end ofthe armsg y areadjusting-plates o o.

The operation is as follows:

As the beam revolves, and the yarns thereon wind off, the plates o o areall the time kept pressed up against the under side of the yarns woundaround the beam, and are thus held by the operation ofthe Weights,

. the weights j j are up near the Lipper ends of the arms k k, making agreater leverage than when further down, and so pressing or binding thebauds fa n more tightly over the beam or its truck, andas the weights godown on the arms k 7c, the binding` of n n, or their friction, isdiminished iu proportion as the cylinder from which the yarns areremoved grows smaller in diameter, and thus the revolution of the beam bis somewhat accelerated, and the yarns always delivered uniformly. Theresult of this is appa-rent.

When the loom. is gauged to a certain number of picks to the inch ou theweb, by means of the weights, the device is then self-adjusting, and thewhole Web is made of uniform closeness of texture.

Practice will readily determine the necessary weight of j 7' fordifferent numbers of picks to the inch, and the length of arms 7s la,and these cau be provided for all varieties of web.

New, it will be seen that when once set to a certain .Dumber of picks tothe inch ou the web, the weaver has no power to change the standard, aswith the old form, and thus accelerate the weaving and change thetexture ofthe cloth.

It is apparent that a variety of forms of the levers g g can beemployed, or a cam could be used instead of them, or gearing, but theprinciple of operation would be the same, the device being governed bythe weights sliding on arms k L.

XVe do not limit ourselves to the exact device herein shown.

What we claim as our invention, and desire to secure by Letters Patent,is-

The combination of standard d, arms g g, rods t i, weights j j, arms Lk, bands n n, with the beam b, as and for the purposes herein set forth.

THOMAS BOOTH. CHARLES CARROLL SANDERSON. Witnesses:

WM. WmrHIGIN, H. UrrroN.

